TAMPA, Fla. – Niners fullback Bruce Miller couldn’t use his left arm to dress himself in the locker room after he sustained an apparent shoulder injury in the fourth quarter of the 49ers’ 33-14 win over the Buccaneers on Sunday.

Miller left the field grimacing and holding his left side after he took a hard hit from safety Keith Tandy at the end of a 10-yard reception. Miller said he was “just sore,” but acknowledged he will likely have an unspecified test Monday to determine the extent of his injury.

Miller, a Pro Bowl alternate in 2012, is in the midst of the best season of his three-year career. In addition to his excellent blocking, he ranks third on the team in receptions (25) and yards (243). Anthony Dixon assumed Miller’s spot after he left with seven minutes left.

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The winner of the Unselfish Play Award: Eric Reid.

With the 49ers leading 33-14, the rookie safety had a sea of teammates around him when he picked off a deflected pass at Tampa Bay’s 22-yard line with just under two minutes left. Reid, however, eschewed a chance for a touchdown and fell to the ground. The 49ers then ended the game with three kneeldowns by Colt McCoy.

Reid said he “looked up and I saw nothing but white jerseys.”

“It probably would have been the easiest touchdown of my life,” Reid said. “I just decided to do the right thing. If we score, that’s another kickoff we have to cover. Another opportunity for someone to get hurt. The defense has to go back out and it’s another opportunity for someone to get hurt. I think we’re going into the end of the year — let’s preserve our bodies and let’s go home.”

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Former 49ers owner Eddie DeBartolo is confident the 49ers will hammer out a contract extension with Jim Harbaugh after speaking with his nephew, 49ers CEO Jed York, on Saturday.

“I think it’s important that he gets things tied up,” DeBartolo said. “And we talked yesterday and I think they’re well on their way to getting it done.”

The status of Harbaugh’s contract became a topic recently after he was reportedly considered to be a candidate at the University of Texas. Harbaugh is in the third season of a five-year, $25 million contract.

DeBartolo, 67, who lives outside Tampa, attended Sunday’s game and will also be in attendance at the final regular-season game at Candlestick Park on Dec. 23.

“It’s going to be totally emotional,” DeBartolo said. “Probably as emotional as I’ve ever (been) in the stadium.”

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Wide receiver Michael Crabtree (5 catches, 45 yards, TD) was flagged for an unsportsmanlike penalty in the fourth quarter after he heaved the ball back to the line of scrimmage following an incomplete pass.

Crabtree, who was a quarterback in high school, tossed the ball in apparent frustration after Colin Kaepernick overthrew him on a deep route.

“We talked about it – (it) ought to remain private, but he said it was his fault,” Harbaugh said. “He knows he shouldn’t have done it. What I think was he ran a good route, was open on the post, got (overthrown). Then picked up the ball and got highjacked a little bit and threw it back in there. Got a heck of an arm.”

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Frank Gore (22 carries, 86 yards) became the 20th running back in NFL history with seven 1,000-yard seasons. Gore has 1,017 yards this season and has rushed for 1,000 yards in seven of his nine years in the league.

“He does everything for our offense,” Kaepernick said. “… What he means to this team and what he contributes really can’t be quantified.”

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Vernon Davis became the first TE in NFL history to register at least 12 TD catches in two different seasons. Davis had 13 TDs in 2009. … With four field goals, Phil Dawson extended his franchise record to 24 consecutive kicks without a miss. Joe Nedney (18) ranks second.